Muffler



B. CARLEN.

NIUFFLER.

APPLICATION FILED IvIAR.22, i917.

Patented Jan. 25, 1921.

UNITED sun-:ls PATENT GFFICE v BJARNE cAnLEN, or SEATTLE, WASHINGTON, AssrGNoE, 4rrr DIRECT AND MEsNE ASSIGNMENTS, TO VACUUM MUFFLER A conroRA'rroN or NEW YoEK.

CORPGRATION, 0F NEW YORK, N. Y., 'A

MUEFLER.

T o allwvho'm t may concemi Be it known that I, BJAENE CARLEN,

a subject ofthe King of Norway,

residing at Seatl tle, in the county of King and State of Wash- 'such manner that all gases emittedfrom said exhaust pipe shall pass throughsaid mufHer; and which muler shall be so constructed that, when it'isso disposed, contiguous ones g of successively discharged separate bodies of gaseous products .of combustion that enter said muiiler shall be emitted therefrom in the form of a silent current, w'thout creating y. back-pressure to opposite movements of the engines pistons, thusfto prevent successive explosive sounds.

I accomplish this lobject by devices illustrated in the accompanying drawings, wherein- Figure 1 is a view yin elevation of one side of one form of muiler embodying my invention;

parts, -in Fi broken liner 2, 2 of Fig. l;

Fig. 3, lis a view in mid-section of a muffler embodying another form 'of my invention;

Fig. 4 is a view in mid-section of a muffler embodying my invention in a form slightly diiferentfrom the form shown in Fig. 3;

Fig. 5 is a view in mid-section .showing another ,forni of my invention;'

Fig is'a view in elevation of one end of v disk11 whose other sidel is provided on its outer edge portion with an annular flange 12 Specication of Letters Patent.

Fig. 2 is a sectional view of the same on Patented Jan. 25, 1921o Aptlieation inea maren 22, 1er?. serial no. 156,593.

nof ythe form of a hollow cylinder which is provided with an internal screw-thread. v

The disk 11 is provided with a plurality of air holes 13 extending(therethrough,

which are disposed atequi-distant points on a circular line intermediary of and concentric with the hub 10 and flange 12. v

A anged disk 14, which is provided with screw-threads on its periphery, is adjustably disposed to be encircled by the flange 12 with its screw-threads in operative engagement with the internal screw-threads of said flange 12, whereby the distance between the inner side surfaces of the disks 11 and 14 may be varied in response to relative rotative movements of the disk 14.v

The inner side of the disk 14 is provided with a concentrically disposed integral boss 15, of greater diameter than the diameter of the passageway through the disk 11 and ctxhaust pipe 9, as shown in Fig. 2, whereby the space between said boss 15 and the inner side surface of the disk 11 will-always be less than the space between other portions of the inner side surface of said disk 14 and the inner side surface f the disk 11.

The loperation of that form of Vmuffler shown in Figs. 1 and 2 is as follows: rll`hey disk 14 being adjusted to a position distant from the inner surface of the disk 11 where it 'will permit the emission of successive separate bodies of products of combustion from the exhaust pipe 9 without creating backpressure, then such separate bodies of products of combustion will successively impinge against the surface of the boss 15 to be diverted and expanded radially through the narrower space between disk 11 into lthe wider space between the disks 14 and 11, and in passing through said narrower space all of said separate bodies` of products of combustion will enter and eX- pand in the` axial direction of the device lnto said wider space and pass therefrom to the 'exterior atmosphere, through the holes 13, in the form of a noisele'ss constant current. l Y

Fig. 3 shows a muiler which differs from the muder of Figs. 1 and-2, in the particulars that instead of a disk like member 11, it embodies a plate 16 of concave-convex form, whose concave side is integral with a hub 17 that is screwed on to the outlet end portion said boss 15 and the lportions thereof,

ofF an exhaust pipe 18 and whose convex side is 'provided on its outer the fiange 12 of Fig. 2.

Adjustably screwed into the flange 19 is a flange 20 that, is integral with the convex' side of a plate 21 also of concavo-convex form, which plate 21 corresponds to thedisk 14.- l l Unlike the disk 11,

plate 21 is provided with a plurality of holes 22, which correspond in function to the holes 13l of Figs. 1 and 2. y

The convex sides of the plates `16 and 21 face each other whereby the central portions of them will always be narrower than the space between other so that the gases will radually expand .simultaneously in two irect1ons.

Obviously, the Inode of operation of the modiiied form of muffler shown in Fig. 3 is similar to the mode of operation of the n iufiler shown in Figs. 1 and 2, since contlguous ones of separate bodies of products of combustion will be blendedA in their passage froin the exhaust pipe 18 into vand through the narrower spacebetween the-cenl l 26, and, further,

,Figs l, 2 and 3, '55

ymember 27 which tral portions of the convexsides of the plates 16 and 21 to flow into the wider space therebetween and thence to' the exterior atmosphere through the holes 22.

Fig. 4 shows a muffler of construction fromthe muiiler of Fig. 3 in the particular that it embodies a flanged lmember 23 which corresponds in function to the plate 1,6 and whose flange 24 is of greater width, said flange 23 being provided with an integral hub 25 that is screwed on to the outlet end portion of an exhaust pipe in the particular that'with- 1n the flange 24 is adjustably disposedV a corresponds in function to the plate 21 of nearly of the form of a parabolic lamp reiector, a plurality of holes 28 which correspond in function to the holes 22 of the plate 21 of of fmulller shown in the same mode of opera-- er of the form shown in except that the rate and the directionJ of the expansion are modified by the form of the directing surfaces, 23 and 27. i f p In Figs. 5 and 6 I have shown another F 1g. 4 has exactl modified form of muffler attached to the outlet end of van exhaust pipe 29 which mulier is provided with a disk 30 having an inte. gral hub 31 that projects from one of lits s1des and an internally screw-threaded flange 32 that projects from its other side integral therewith and Y`.which corresponds in edge portion flangeJ 19, correspondingto Y sponding the plate 16 is not provided with holes therethrough, but the 'washer 37, as the space between different in form Fig. 3, but which is more said member 27 being provided with v 42 and 43 be less than th form to the disk 11 of Fig. 2, but which is not provided with holes corresponding with the holes 13 of said disk 11.

Within said` flange 32 is adjustably disposed a flanged disk 33 provided with a screw-thread on its periphery which opera, tively engages with the internal Screwthread of the flange 32, said disk 33 correto the disk 14 of Fig. 2, exceptin the partlculars that said disk 33 is provided with air holes 34 and instead of the b'oss 15 itis provided with a deflector plate 35 secured to but spaced from the inner surface of said disk 33 by means of a screw 36 and more clearly shown in- Fi 5.

Obviously, the modified form of mu er shown in Figs. 5 and 6 is adapted to operate by similar mode of operation as the mufllers shown by Figs. 1, 2, 3 and 4, successive separate bodies of products of. combustion being emitted from the exhaust pipe 29 to impingeagainst the inner surface of the defiector plate 35 to radiate and pass between said delector plate 35 and the inner surface of the disk 30, thence around the periphery of said plate 35, thence to and through the holes 34 to the exterior atmosphere, said successive' separate bodies of products of combustion passing through the muffler to issue from said holes 34 in the form of a silent current.

In Figs. k7' and 8, I have shown a muliier embodying a preferred vforni of my invention,'whieh muffler is attached to the outlet end portion of an exhaust pipe 38, and which embodies a disk 39, from one side of which projects an integral hub 40 that is screwed on `to said exhaust pipe 38 as shown in Fi 7, and to the other side of said disk 39 1s fastened, by equi-distantly disposed bolts 41,

43, 44, 45, and 46, n

a plurahty of plates 42, adjacent ones of which are other by washers 47, 48, 49 and 50,'the plate 42 being Aalsol spaced from the disk 39 by lwashers 51. p

Only the plates 42, 43, 44 and 45 are provided each with a hole 52 through its central portion concentric with the outlet end 4of thev exhaust pipe 38. r

While I have shown the holes 52 as being of the same diameter and have shown the Washers 47, 48, 49, 50 and 51 as being of the same thickness, said holes 52 and said washspaced from each ers may be varied in dimensions to suit different conditions of operation.

Under some conditions it is preferable that the space between the plates 45 and 46 be less than the space between the plates 44 and 45, and the space between the plates 43 and 44 be less than the space between the plates 42 and 43, and the spacejbetween the plates e space between the' plate 42 and the disk 39 .and also under most conditions it is preferable that the hle 52 of the plate 45 be smallest in diameter and the hole 52 through combination which are emitted in rapid sucf cession Ifrom the outlet end of the exhaust pipe 38 will pass othrough the holes 52 to impnge against theyinner surface of the central portion of the plate 46, and such gases in response to the pressure thereof will escape spaces being narrow from said cylindrical space through the spaces between adjacent ones of the plates 42, 43, 44, 45 and 46 and through the space between the disk 39 and the plate 42; which and the walls thereof being of great area, will tend to cause such flow to be constant, with the result that su/ch gases will be emitted from said spaces into the outer atmosphere in the form of a constant silent current.

If it be desired that the several currents v of gases be deflected upon their emission from the several spaces to cause them to flowA all in a direction parallel with the axis of the exhaust pipe 38, then in such case, a deiector of the form indicated by dotted lines in Fig. 7, may be attached to the muffler, which deflector in an obvious manner will cause all of said currents to flow in a direcf tion at right angles to the plane of the plate 46.

In all of the mulliers, of Figs. 1 to 8y inclusive, gases passing therethrough, first pass through a'constricted passageway therein to a larger passageway, thence to theexterior atmosphere through a plurality passageways.

In all of the figures of the drawings, the reduction of pressure is effected by expansion in a' radial direction, but in order to reduce the pressure as rapidly as possible it isprefof smaller.

erable that the expansion also takes place in an additional direction, transverse to its direction of flow. Y

In order to avoid all noise the expansion should be gradual until the gases have expanded, so that when they issue from the muffler there will be no noise due to sudden expansion into the open atmosphere.

In order to provide aproper operation sudden changes inthe direction of, flow are to be avoided during expansion until the gases have been suiiiciently reduced in pressure to Aavoid noise, after which the gases may be deflected in any direction. Y

The arrangements shown are such that in the expanding channels of the muffler the velocity of the 'gases is greatly increased, enabling the engine to exhaust more completely and more rapidly. Use of this type of mulle shows decided beneficial results in operation of thesengines.

Obviously, changes may be made in the forms, dimensions, and arrangement of parts of my invention without departing from the spirit thereof.

What I claim is:

In amuflier for exhaust pipes, ktwo elements, one of which is a circular flange for attachment on the end of said pipe, a circular deflector plate opposite the ends of said pipe and having discharge orifices therein, said flange and plate having threaded flanged connections at their peripheries' whereby said plate can be adjusted to and from said flange, said plate forming a narrow passage with) said flange sufficient to produce a dilminished pressure between the flange and ate. p In witness whereof, I'hereunto subscribe my name this 17th day of March, A. D.

, i BJ ARNE CARLEN. 1

Alitness: e C. J. SMITH. 

